CN101902767B - Wireless communication system and wireless communication method for switching wireless channels - Google Patents
Wireless communication system and wireless communication method for switching wireless channels Download PDFInfo
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- CN101902767B CN101902767B CN2010101882720A CN201010188272A CN101902767B CN 101902767 B CN101902767 B CN 101902767B CN 2010101882720 A CN2010101882720 A CN 2010101882720A CN 201010188272 A CN201010188272 A CN 201010188272A CN 101902767 B CN101902767 B CN 101902767B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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Abstract
The invention provides a wireless communication system and a wireless communication method for switching wireless channels. In a wireless communication system including a plurality of wireless terminal apparatuses and a relaying apparatus, the relaying apparatus performs a channel search to select a wireless channel in a good communication situation when the relaying apparatus transmits a beacon signal at a constant period, and transmits switching destination information to be used to switch the wireless channel to the selected one in a state of being stored in the beacon signal. When the communication situation of the wireless channel has deteriorated, the relaying apparatus switches the wireless channel being used by the communication section to the selected one based on the switching destination information. When the communication situation of a wireless channel of the wireless terminal apparatus has deteriorated, the wireless terminal apparatus switches the wireless channel to theselected one based on the switching destination information.
Description
Technical field
The application is based on the Japanese patent application No.2009-125135 that for example proposed on May 25th, 2009 and require its priority, incorporates as a reference its all the elements at this.
The present invention relates to switching destination information according to wireless channel and come wireless communication system and wireless communications method that wireless channel is switched.
Background technology
In recent years, the wireless communication system that uses WLAN (Local Area Network) to carry out the mass data transmitting-receivings such as dynamic image, still image, voice between relay and wireless terminal device is popularized.But, in this wireless communication system, as can be known: owing to the wireless mass data of receiving and dispatching, so descend because various cause of failures can cause throughput, produce the chaotic and interruption of image and voice.
Therefore, need to use non-interfering wireless channel in a plurality of wireless channels by selecting each wireless communication system, thereby avoid interference.Since the selection of this wireless channel be difficult to by the user according to around environment set, judge that the communication conditions of each wireless channel carries out the technology of the switching of wireless channel so have by relay.
TOHKEMY 2006-94394 communique discloses a kind of radio communication device, in the situation that the communication conditions that detects the wireless channel that carries out radio communication worsens, preferentially send the switching indication of wireless channel to other radio communication device than other data-signals.Yet, in this technology, in the situation that communication conditions sharply worsens and communication conditions near situation about worsening the wireless terminal device side, when the relaying device carries out the change of wireless channel, wireless terminal device can not obtain the information of wireless channel after changing, can't communicate with relay.Therefore, wireless terminal device carries out the scanning of all channels, finds out wireless channel after changing.
And, TOHKEMY 2008-148254 communique discloses following technology: obtain the free timeslot surplus in the action channel, in the situation of the free timeslot surplus of obtaining less than or equal to channel change time slot surplus, if have idle channel, to represent that then channel changes time (super frame number) before and the information of channel after changing etc. and is kept in beacon (beacon) signal, send this beacon signal, the channel that will move changes to this idle channel.Yet, in this technology, determining channel after changing, the time before the expression channel is changed and the information of channel after changing etc. are kept in the beacon signal and send.Therefore, in the situation that communication conditions sharply worsens, wireless terminal device can't receive this beacon signal, and existence can not be rapidly and stably carried out the problem of the change of wireless channel.
Summary of the invention
The present invention is directed to the rapid variation of communication conditions, can be rapidly and stably realize the switching of wireless channel, and can realize the stabilisation of communication quality.
The wireless communication system of the first invention, it possesses a plurality of wireless terminal devices and carries out the relay of radio communication with described a plurality of wireless terminal devices, and described relay has: storage part, the switching destination information of its storage wireless channel; Department of Communication Force, it uses any one wireless channel in a plurality of wireless channels to send beacon signal to described a plurality of wireless terminal devices, carries out radio communication; And control part, it is when sending described beacon signal by described Department of Communication Force, to be stored in for the switching destination information of any one wireless channel that switches to described a plurality of wireless channels in the described storage part, and be kept in the beacon signal, send this beacon signal by described Department of Communication Force, in the situation that the communication conditions of the wireless channel that described Department of Communication Force uses worsens, the employed wireless channel of described Department of Communication Force is switched to based on the wireless channel that is stored in the switching destination information in the described storage part, described wireless terminal device has: terminal storage section, the switching destination information of its storage wireless channel; Terminal communication section, it receives the described beacon signal that sends from described relay with any one wireless channel in described a plurality of wireless channels, carries out radio communication; And terminal control section, when it receives described beacon signal in described terminal communication section, be stored in the described terminal storage section being kept at described switching destination information in this beacon signal, in the situation that the communication conditions of the employed wireless channel of described terminal communication section worsens, the employed wireless channel of described terminal communication section is switched to based on the wireless channel that is stored in the switching destination information in the described terminal storage section.
The wireless communication system of the second invention, in the wireless communication system of the first invention, described control part is when sending described beacon signal by described Department of Communication Force, detect the communication conditions of described a plurality of wireless channels by described Department of Communication Force, select the good wireless channel of communication conditions in the communication conditions of these detected a plurality of wireless channels, and the wireless channel that will select is made as any one wireless channel in described a plurality of wireless channel.
The wireless communication system of the 3rd invention, in the wireless communication system of the first invention, described relay possesses 2 described Department of Communication Forces, described control part uses a Department of Communication Force in described 2 Department of Communication Forces, use any one wireless channel in described a plurality of wireless channel, when sending described beacon signal, send and preserve the described beacon signal of described switching destination information and carry out radio communication, in the situation that the communication conditions of a described employed wireless channel of Department of Communication Force worsens, send from a described Department of Communication Force with the cycle shorter than the cycle before the communication conditions deterioration of described wireless channel preserving the described beacon signal that is stored in the described switching destination information in the described storage part, use is based on the wireless channel that is stored in the switching destination information in the described storage part, and the described beacon signal that will preserve described switching destination information when sending described beacon signal sent from another Department of Communication Force with the premalignant cycle of the communication conditions of described wireless channel.
The wireless communication system of the 4th invention, the 3rd the invention wireless communication system in, described control part under the described a plurality of wireless terminal devices that carried out radio communication with a described Department of Communication Force all switch to situation with the radio communication of described another Department of Communication Force, the transmission of preserving the described beacon signal that is stored in the described switching destination information in the described storage part that the shorter cycle in cycle before stopping to be worsened with the communication conditions than described wireless channel by a described Department of Communication Force carries out.
The wireless communication system of the 5th invention, in the wireless communication system of the first invention, described terminal control section receives in the situation of probability less than predefined probability of the described beacon signal that sends from described relay in described terminal communication section, and the communication conditions of differentiating for the employed wireless channel of described terminal communication section worsens.
The wireless communication system of the 6th invention, in the wireless communication system of the first invention, described terminal control section is in the situation that the communication conditions of the employed wireless channel of described terminal communication section worsens, make described terminal communication section keep the state that can receive described beacon signal with the predefined time, within this predefined time, do not receive in the situation of described beacon signal, switch the employed wireless channel of described terminal communication section according to the described switching destination information that is stored in the described terminal storage section, carry out the reception of described beacon signal.
The wireless communications method of the 7th invention, it is the wireless communications method of a plurality of wireless terminal devices and relay, described a plurality of radio communication device has terminal communication section, this terminal communication section receives the beacon signal that sends from relay with any one wireless channel in a plurality of wireless channels, carries out radio communication; Described relay has Department of Communication Force, this Department of Communication Force uses any one wireless channel in described a plurality of wireless channel to send described beacon signal to described a plurality of wireless terminal devices, carry out radio communication, described wireless communications method is characterised in that, it possesses following steps: when sending described beacon signal by described Department of Communication Force, to be stored in for the switching destination information of any one wireless channel that switches to described a plurality of wireless channels in the storage part that described relay has, and be kept in the beacon signal; Described Department of Communication Force sends the beacon signal of preserving described switching destination information; In the situation that the communication conditions of the wireless channel that described Department of Communication Force uses worsens, the employed wireless channel of described Department of Communication Force is switched to based on the wireless channel that is stored in the switching destination information in the described storage part; When the described terminal communication section of described wireless terminal device receives described beacon signal, be stored in the terminal storage section that described wireless terminal device has being kept at described switching destination information in this beacon signal; In the situation that the communication conditions of the employed wireless channel of described terminal communication section worsens, the employed wireless channel of described terminal communication section is switched to based on the wireless channel that is stored in the switching destination information in the described terminal storage section.
The wireless communications method of the 8th invention, in the wireless communications method of the 7th invention, described Department of Communication Force sends and preserves this step of beacon signal of described switching destination information when sending described beacon signal by described Department of Communication Force, detect the communication conditions of described a plurality of wireless channels by described Department of Communication Force, select the good wireless channel of communication conditions in the communication conditions of these detected a plurality of wireless channels, and the wireless channel that will select is made as any one wireless channel in described a plurality of wireless channel.
According to the present invention, for the rapid variation of communication conditions, can be rapidly and stably realize the switching of wireless channel, and can realize the stabilisation of communication quality.
Advantage of the present invention will be set forth in the following description, and part is apparent according to specification, perhaps can know by the practice of invention.Advantage of the present invention can be by the following multiple means that particularly points out and in conjunction with realizing and obtaining.
Description of drawings
Be merged in the specification and consist of specification a part the accompanying drawing illustration embodiments of the invention, and with the above general introduction that provides and below the detailed description one of the embodiment that provides be used from and explain principle of the present invention.
Fig. 1 is the summary construction diagram of wireless communication system.
Fig. 2 is the summary construction diagram of the relay in the execution mode 1.
Fig. 3 is the figure of the example of expression beacon frame.
Fig. 4 is the summary construction diagram of wireless terminal device.
Fig. 5 is the flow chart of the beacon transmission processing in the execution mode 1.
Fig. 6 is the flow chart of the wireless channel hand-off process in the execution mode 1.
Fig. 7 is the summary construction diagram of the relay in the execution mode 2.
Fig. 8 is the flow chart of the beacon transmission processing in the execution mode 2.
Fig. 9 is the sequential chart for the beacon transmission processing of the 1st Department of Communication Force and the 2nd Department of Communication Force.
Figure 10 is the sequential chart of the wireless channel hand-off process in the execution mode 2.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are elaborated.In addition, this invention is not limited by this execution mode.And this working of an invention mode represents the most preferred execution mode of the present invention, and the term of this invention is not limited to this.
[execution mode 1]
At first, structure is described.
Fig. 1 illustrates the summary construction diagram of the wireless communication system A in the present embodiment 1.
As shown in Figure 1, wireless communication system A possess the relay 1a that is connected with other relays or external device (ED) via communication network N and with a plurality of wireless terminal devices 2 of relay 1a wireless connections.
Suppose that wireless communication system A in the present embodiment 1 is according to the standard of IEEE802.15.4.In this case, relay 1a is equivalent to telegon, and wireless terminal device 2 is equivalent to terminal equipment.
Fig. 2 illustrates the summary construction diagram of the relay 1a in the present embodiment 1.
As shown in Figure 2, relay 1a possesses control part 10, storage part 11, end message memory 12, beacon transmission timer 13, the 1st Department of Communication Force 14, wired I/F (InterFace) 16, buffer 17 etc., and each one is electrically connected.
CPU), ROM (Read Only Memory: read-only memory), RAM (Random Access Memory: random access memory) etc. control part 10 possesses CPU (Central Processing Unit:.Control part 10 is from being stored in storage part 11 and end message with reading specified program, table and data in the various programs the memory 12, various table and the data etc., and be deployed into the working region of RAM or storage part 11, by with said procedure cooperate to carry out various processing, and be kept at its result in the RAM or storage part 11 and end message with in the presumptive area of memory 12, and each one in the indication relay 1a, the whole action of unified control relay 1a.
As employed wireless channel, for example refer in IEEE802.15.4 2.4[GHz] any one wireless channel in all 16 wireless channels of 11ch～26ch after frequency band 16 is cut apart.
In the beacon transmission processing of present embodiment 1, carry out following processing.
At first, when the 1st Department of Communication Force 14 sends beacon signal with the constant cycle, select any one wireless channel in a plurality of wireless channels.Detect the communication conditions of a plurality of wireless channels by the 1st Department of Communication Force 14, the wireless channel of this selection is best wireless channel or the reasonable wireless channel of communication conditions of communication conditions in the communication conditions of these a plurality of wireless channels that detect.
And the switching destination information that is used for switching to selected wireless channel (switching the destination channel) is stored in storage part 11 and is kept in the beacon signal, and this beacon signal sends by the 1st Department of Communication Force.
And, in the situation that the communication conditions of the employed wireless channel of the 1st Department of Communication Force worsens, when utilizing the employed wireless channel of the 1st Department of Communication Force to send beacon signal, switch to based on the wireless channel that is stored in storage purpose ground information in the storage part 11.
So-called beacon signal is the grouped data that sends with the constant cycle from relay 1a, is used for making the wireless terminal device 2 and the relay 1a that are connected on the wireless communication system A synchronous.
Fig. 3 illustrates the example of the beacon frame in the present embodiment 1.
As shown in Figure 3, beacon signal has the regional B1 of MHR (MAC (Media Access Control) head), the regional B3 of MAC payload zone B2, MFR (MAC Footer), is based on the IEEE802.15.4 standard.
MHR zone B1 comprises frame control B11, address area B12 etc.MAC payload zone B2 comprises SS (Superframe Specification) B21, GTS (Guaranteed Time Slot) field B22, PA (Pending Address) field B23, beacon payload B24 etc.
SSB21 is the details field of super frame, defined to be used for the communication mode that beacon that the time when receiving beacon manages sends interval and beacon.GTS field B22 comprises the communication mode that wireless terminal device ensures (for example, GTS) information.PA field B23 comprises terminal identification information (node address), and this terminal identification information is in the situation with the data that send to wireless terminal device, and identification sends the wireless terminal device of data.Beacon payload B24 comprises the payload zone about 50 bytes.Preserve the switching destination information in this signal payload B24.
Switch destination information and comprise the channel number of switching destination channel and the ID code of the signal number that the destination channel is switched in expression etc.
The switching destination information that is stored in the storage part 11 is rewritten when each transmission beacon signal.
End message with memory 12 by consisting of by the memory that electricity is eliminated and rewritten.End message is preserved the information such as node address of the wireless terminal device 2 in the zone that can communicate by letter that is present in relay 1a self with memory 12.
The 1st Department of Communication Force 14 possesses modulation circuit, demodulator circuit, RF (Radio Frequency) circuit, antenna 14a etc., plays a role as the Department of Communication Force that carries out radio communication with any one wireless channel in a plurality of wireless channels and a plurality of wireless terminal device.
The divide into groups adjustment of transmitted power of (packet) of the 1st Department of Communication Force 14, and the data that send according to the indication from control part 10 are encoded to consist of grouping, the grouping that consists of is modulated, send grouping via antenna 14a to wireless terminal device 2.And, the receiving sensitivity adjustment that the 1st Department of Communication Force 14 divides into groups, and the grouping that receives via antenna 14a carried out demodulation, and will resolve the data that obtain to the grouping after the demodulation and export to control part 10.
And, the 1st Department of Communication Force 14 scanning a plurality of wireless channels (for example, 11～26 channels) electric field strength separately, and will scan the result who obtains and export to storage part 11.
Wired I/F 16 carries out following Control on Communication: communicate with other relays 1a or the external device (ED) that are connected via communication network N by predetermined communication mode.
The data that buffer 17 temporary transient storages receive via wired I/F 16.
Fig. 4 illustrates the summary construction diagram of wireless terminal device 2.
As shown in Figure 4, wireless terminal device 2 possesses control part 20, storage part 21, address memory 22, starts with timer 23, power control part 24, display control unit 25a, display part 25b, terminal communication section 26 etc., and each one is electrically connected.And wireless terminal device 2 possesses battery B, provides electric power from battery B to each one according to the control signal from power control part 24.
Control part 20 possesses CPU, ROM, RAM etc., read specified program, table and data in various programs from be stored in storage part 21, various table and the data, and be deployed in the RAM or the working region in the storage part 21, by with said procedure cooperate to carry out various processing, and be kept at its result in the RAM or the presumptive area of memory 21 in, and each one in the indication wireless terminal device 2, the whole action of unified control wireless terminal device 2.
Control part 20 plays a role as the terminal control section that carries out the wireless channel hand-off process according to the beacon signal that sends from relay.
In the wireless channel hand-off process, when terminal communication section 26 receives beacon signal, the switching destination information that is saved in this beacon signal is stored in the storage part 21.And, in the situation that the communication conditions of the employed wireless channel of terminal communication section worsens, terminal communication section 26 employed wireless channels are switched to based on the wireless channel that is stored in the switching destination information in the storage part 21.
Storage part 21 can be made of by the nonvolatile memory that electricity is eliminated and rewritten recording medium magnetic, optics or semiconductor etc., is fixedly installed in the wireless terminal device 2 or freely installation with loading and unloading.And pre-stored in the storage part 21 have the performed various programs of control part 20 and the employed various tables of these programs and data etc., and play a role as the terminal storage section that stores the switching destination information that obtains from beacon signal.The switching destination information that is stored in the storage part 21 is being rewritten when the beacon signal that receives is obtained at every turn.
The address with memory 22 by consisting of by the nonvolatile memory that electricity is eliminated and rewritten.The address stores terminal identification information (node address) for identified wireless terminal device 2 self with memory 22.
Starting with timer 23 is the timers that carry out timing for to the startup timing (Startup time) of terminal communication section 26, expression has been reached the startup timing signal that sends timing exported to control part 20.Start regularly basis from the transmission cycle of the beacon signal of relay 1a transmission, set by control part 20.
Power control part 24 is according to the power supply of controlling wireless terminal device 2 integral body from the indication of control part 20, and each one in the wireless terminal device 2 provide the electric power from battery B.
Battery B is such as being the primary cells such as alkaline dry cell and manganese dry cell or the secondary cells such as nickel-cadmium cell and Ni-MH battery, lithium ion battery etc.
Display control unit 25a is presented at various information on the display part 25b according to the demonstration indication from control part 20 inputs.
Display part 25b is by formations such as LCD (Liquid Crystal Display) and EL (ElectroLuminescence) displays, according to from the signal of display control unit 25a input with various picture displies on display.
Terminal communication section 26 possesses wireless transmission part 26a, the 26b of wireless receiving section, SW (switching part) 26c, antenna 26d etc., receives from the beacon signal of relay 1a transmission with any one wireless channel in a plurality of wireless channels and carries out radio communication.
Wireless transmission part 26a possesses modulation circuit and RF (Radio Frequency) circuit etc., the adjustment of the transmitted power of dividing into groups, and the data that send according to the indication from control part 20 are encoded to consist of grouping, the grouping that consists of is modulated, send grouping via antenna 26a to relay 1a.
The 26b of wireless receiving section possesses demodulator circuit and RF circuit etc., the receiving sensitivity adjustment of dividing into groups, and the grouping that receives via antenna 26d carried out demodulation, and will resolve the data that obtain to the grouping after the demodulation and export to control part 20.
And the 26b of wireless receiving section scans a plurality of wireless channels (for example, 11～26 channels) electric field strength separately via antenna 26d, and will scan the result who obtains and export to storage part 21.
SW 26c is arranged between antenna 26d and wireless transmission part 26a or the 26b of wireless receiving section, according to the indication from control part 20, switches the grouping reception/electric field strength that grouping sends or the 26b of wireless receiving section the carries out scanning from wireless transmission part 26a.
Next, the action of present embodiment 1 described.
Fig. 5 is illustrated in the flow chart of the beacon transmission processing of carrying out among the relay 1a.In addition, processing shown in Figure 5 by in the relay 1a control part 10 and the cooperation of each one carry out, provide to relay 1a electric power during carry out.
That is, by step S1, the result of the electric field strength of each wireless channel that will obtain in step S1 obtains as the communication conditions of each wireless channel.
The switching destination information that control part 10 will comprise the information of switching the destination channel etc. is stored in the storage part 11, and will switch the beacon payload interior (step S3) that destination information is kept at beacon signal, send these beacon signals (step S4) from the 1st Department of Communication Force 14.
In step S5, control part 10 is differentiated the communication conditions of the 1st Department of Communication Force 14 employed wireless channels according to the reception situation for the ack signal of the beacon signal that sends that sends from wireless terminal device 2 among step S4.
(step S5 in the situation of not switching wireless channel; No), control part 10 returns the processing of step S1.Be the situation of "No" as step S5, for example in the situation of the ack signal that can from all wireless terminal devices, receive the beacon signal that sends for step S4, differentiate the not deterioration of communication conditions for the wireless channel that is using, differentiate for not switching wireless channel.
(step S5 in the situation of switching wireless channel; Be), the wireless channel that control part 10 uses the 1st Department of Communication Force switches to based on the wireless channel that is stored in the switching destination information in the storage part 11 (switching the destination channel) (step S6), and returns the processing of step S1.
Be the situation of "Yes" as step S5, for example in the situation of the ack signal that can not from all wireless terminal devices, receive the beacon signal that sends for step S4, differentiate the communication conditions deterioration for the wireless channel that is using, differentiating is to switch wireless channel.
In addition, relay 1a is sending in the situation of data request signal the executing data transmission processing from wireless terminal device 2 for the beacon signal that sends.In this data sending processing, send ack signal, data-signal from the 1st Department of Communication Force 14 to the wireless terminal device 2 that has sent this data request signal, the ack signal that the 1st Department of Communication Force 14 receives for this data-signal.
Fig. 6 is illustrated in the flow chart of the wireless channel hand-off process of carrying out in the wireless terminal device 2.In addition, processing shown in Figure 6 is carried out by the control part 20 in the wireless terminal device 2 and the cooperation of each one, provide to wireless device 2 electric power during carry out.
Control part 20 is not inputted (step S11 in the situation that starts timing signal by starting to differentiate whether inputted startup timing signal (step S11) with timer 23; No), return the processing of step S11.
Input (step S11 in the situation that starts timing signal; Be), control part 20 is differentiated in the wireless channel of terminal communication section 26 current settings, whether can receive beacon signal (step S12) from relay 1a.
(step S12 in the situation that can not receive beacon signal; No), control part 20 is preserved 0 (the step S13) that expression can not receive beacon signal (NG) in the register that storage part 21 has, enter step S17.Register can use shift register etc., and this shift register can be preserved from the differentiation result of up-to-date step S12 to the past differentiation result of step S12 for several times.
(step S12 in the situation that can receive beacon signal; Be), control part 20 obtains the switching destination information in the beacon payload that is kept at the beacon signal that receives, and the switching destination information that this obtains is stored in (step S14) in the storage part 21.And control part 20 sends ack signal (step S15) by terminal communication section 26 to relay 1a.
And control part 20 is preserved expression in the register that storage part 21 has can receive 1 (step S16) of beacon signal (OK), and enters step S17.
Whether control part 20 according to the communication conditions of terminal communication section 16 employed wireless channels, differentiates switching terminal Department of Communication Force 26 employed wireless channels (step S17) behind step S13 or step S16.In step S17, the register that control part 20 has with reference to storage part 21, the communication conditions of differentiation terminal communication section 26 employed wireless channels.
(step S17 in the situation of not switching wireless channel; No), control part 20 returns the processing of step S11.
Be the situation of "No" as step S17, the register that for example has with reference to memory 21, in the situation of the probability that can receive beacon signal more than or equal to predefined probability, the communication conditions of differentiating terminal communication section 26 employed wireless channels does not worsen, and differentiates for not switching wireless channel.
(step S17 in the situation of switching wireless channel; Be), control part 20 switches to terminal communication section 26 employed wireless channels based on the wireless channel that is stored in the switching destination information in the storage part 21 in step S14 (switching the destination channel) (step S18), and returns the processing of step S11.
Be the situation of "Yes" as step S17, the register that for example has with reference to memory 21, in the situation of the probability that can receive beacon signal less than predefined probability, the communication conditions of differentiating terminal communication section 26 employed wireless channels worsens, and differentiates for switching wireless channel.
Like this, wireless terminal device 2 according to the probability of acceptance of the beacon signal that sends from relay, can carry out the differentiation of the communication conditions of terminal communication section 26 employed wireless channels with reference to register.
In addition, in that being shown, the beacon signal that receives has with from as the data of destination the time wireless terminal device 2 executing data reception ﹠ disposals.
In this data receiver is processed, send data request signal from terminal communication section 26 to relay 1a.And, receive ack signal, the data-signal that sends from relay 1a by terminal communication section 26, send ack signal from terminal communication section 26 to relay 1a.
As mentioned above, according to present embodiment 1, relay 1a is when sending beacon signal, to be kept in the beacon signal for any one the switching destination information of wireless channel that switches to a plurality of wireless channels, in the situation that communication conditions worsens, switch to the wireless channel based on this switching destination information, wireless terminal device 2 can switch to based on the wireless channel that is kept at the switching destination information in the beacon signal that receives and carry out radio communication in the situation of the communication conditions deterioration of employed wireless channel.
Therefore, even communication conditions sharply worsens, wireless terminal device 2 can not receive in the situation from the beacon signal of relay 1a, wireless terminal device 2 also can switch the wireless channel of the switching destination information that comprises based on the beacon signal that received that is stored in the terminal storage section 21 before communication conditions worsens, can carry out radio communication with relay 1a.
Therefore, for the rapid variation of communication conditions, can be rapidly and stably realize the switching of wireless channel, can realize the stabilisation of communication quality.
In addition, relay 1a is when sending beacon signal, owing to will be kept in the beacon signal be used to the switching destination information that switches to the best wireless channel of communication conditions or the reasonable wireless channel of communication conditions, so in the situation that communication conditions worsens, relay 1a and wireless terminal device 2 can switch to the best wireless channel of communication conditions or the reasonable wireless channel of communication conditions carries out radio communication.
[execution mode 2]
At first, structure is described.
The schematic configuration of the wireless communication system in the present embodiment 2 is except relay 1a becomes relay 1b, and is identical with the schematic configuration of wireless communication system in the execution mode 1 shown in Figure 1, so the diagram of omission and explanation.
Fig. 7 illustrates the summary construction diagram of the relay 1b in the present embodiment 2.
As shown in Figure 7, the structure of relay 1b is for also possessing the 2nd Department of Communication Force 15 with the 1st Department of Communication Force 14 same structures in the relay 1a of execution mode 1, and other part is identical with the relay 1a of execution mode 1, so different piece only is described.
In addition, the 1st Department of Communication Force and the 2nd Department of Communication Force are generically and collectively referred to as Department of Communication Force.
In the performed beacon transmission processing of the control part 10 of present embodiment 2, use in the 1st Department of Communication Force 14 and the 2nd Department of Communication Force 15.And, in a Department of Communication Force, use any one wireless channel in a plurality of wireless channels, when sending beacon signal, preserve the beacon signal of switching destination information with transmission of predetermined constant cycle (the 1st cycle), carry out radio communication with a plurality of wireless terminal devices 2.
When sending beacon signal with the constant cycle (the 1st cycle), same with execution mode 1, detect the communication conditions of a plurality of wireless channels by a Department of Communication Force that carries out radio communication.And, the best wireless channel of communication conditions in the communication conditions of a plurality of wireless channels that selection detects.Be stored in storage part 11 for the switching destination information that switches to this selected wireless channel (switching the destination channel), and be kept in the beacon signal.And a Department of Communication Force that carries out radio communication sends this beacon signal.Perhaps, also can select the reasonable wireless channel of communication conditions.
In the situation that the communication conditions of an employed wireless channel of Department of Communication Force that carries out radio communication worsens, the beacon signal of preserving the switching destination information that is stored in the storage part 11 worsens the short cycle (the 2nd cycle) in cycle (the 1st cycle) that sends beacon signal before with the communication conditions than wireless channel, sends from a Department of Communication Force.And, use based on the wireless channel that is stored in the switching destination information in the storage part 11, when sending beacon signal, the beacon signal of preserving new switching destination information sent from another Department of Communication Force with the 1st cycle.
Under a plurality of wireless terminal devices that carried out radio communication with a Department of Communication Force all switch to situation with the radio communication of another Department of Communication Force, stop Department of Communication Force performed with the 2nd cycle carry out to preserving the transmission of the beacon signal of switching destination information, end the transmission processing of the beacon signal in this Department of Communication Force.
Beacon signal in the present embodiment 2 is identical with execution mode 1, so omit diagram and the explanation of beacon frame.
The 2nd Department of Communication Force 15 is identical with the structure of the 1st Department of Communication Force 14 of execution mode 1, so description thereof is omitted.
Schematic configuration and the execution mode 1 of the wireless terminal device 2 in the present embodiment 2 are same, so the diagram of omission only illustrates different parts.
In the performed wireless channel hand-off process of the control part 20 of present embodiment 2, when receiving beacon signal in terminal communication section 26, the switching destination information that is kept in this beacon signal is stored in the storage part 21.
And, in the situation that the communication conditions of the employed wireless channel of terminal communication section worsens, the state that can receive beacon signal is kept the 26 predefined time of terminal communication section (reception is held time), reception hold time during can not receive in the situation of beacon signal, switching destination information switching terminal Department of Communication Force 26 employed wireless channels according to being stored in the storage part 21 carry out the reception of beacon signal.
Then, the action of present embodiment 2 described.
Fig. 8 illustrates the flow chart to the beacon transmission processing of the 1st Department of Communication Force 14 among the relay 1b and 15 execution of the 2nd Department of Communication Force.In addition, processing shown in Figure 8 by the control part 10 in the relay 1b and each one cooperate carry out, provide to relay 1b electric power during carry out.
At first, the beacon transmission processing that the 1st Department of Communication Force 14 is carried out is described.
Step S 1～S5 shown in Figure 5 that step S21～S25 carries out when sending timing signal by the beacon transmission timer with the 1st periodical input beacon is identical, so description thereof is omitted.In the 1st Department of Communication Force 14 processing of execution in step S21～S25 during, the 2nd Department of Communication Force 15 is abort state.
Switching synchronizing signal is be used to the synchronous signal of action of getting the 1st Department of Communication Force 14 and the 2nd Department of Communication Force 15.Switch synchronizing signal to sent the Department of Communication Force of beacon signal with the 1st cycle, transmission with short the 2nd cycle indication beginning beacon signal of the 1st cycle of period ratio, to the Department of Communication Force of abort state, use based on the transmission of the wireless channel that is stored in the switching destination information in the storage part 11 with the 1st cycle indication beginning beacon signal.
In the differentiation of step S28, whether control part 10 during current, differentiates delivery channel finishing switching signal from output switching synchronizing signal (step S26).
Channel finishing switching signal from all wireless terminal device is receiving the signal the situation of ack signal in exported by the Department of Communication Force (being the 2nd Department of Communication Force 15) that sends beacon signal with the 1st cycle from the output switching synchronizing signal here during current.
That is, channel finishing switching signal a plurality of wireless terminal devices that to be expression carry out radio communication with the Department of Communication Force (being the 1st Department of Communication Force 14) that sends beacon signal with the 2nd cycle here all switch to the signal with the radio communication of another Department of Communication Force (being the 2nd Department of Communication Force 15) here.
Switch (step S28 in the unclosed situation at channel; No), control part 10 returns the processing of step S28.
(step S28 in the situation of channel finishing switching; Be), control part 10 is for the 1st Department of Communication Force 14, stops the transmission of the beacon signal of carrying out with the 2nd cycle, ends the transmission processing (step S29) of beacon signal.
Exporting (step S30 in the situation of switching synchronizing signal; Be), when the beacon transmission timer with the 1st periodical input beacon when sending timing signal, control part 10 uses the 1st Department of Communication Force 14 to carry out channel searchs, detects the communication conditions (step S31) of all wireless channels.The performed channel search of step S31 is identical with the step S1 of Fig. 5, so description thereof is omitted.
Step S32, S33 are identical with step S2, the S3 of Fig. 5, so description thereof is omitted.
In the differentiation of step S35, from output switching synchronizing signal (step S30; ) till now during, the Department of Communication Force (being the 1st Department of Communication Force here) that sends beacon signal with the 1st cycle receives from all wireless terminal devices in the situation of ack signal, control part 10 is differentiated the channel finishing switching.
Switch (step S35 in the unclosed situation at channel; No), control part 10 returns the processing of step S31.
(step S35 in the situation of channel finishing switching; Be), control part 10 delivery channel finishing switching signals (step S36) return the processing of step S21.
Then, the beacon transmission processing that the 2nd Department of Communication Force 15 shown in Figure 8 is carried out is described.
The beacon transmission processing that the 2nd Department of Communication Force 15 is carried out is identical with the contents processing of the beacon process that the 1st Department of Communication Force 14 is carried out, thus the explanation corresponding relation, detailed.
The step S41 that the 2nd Department of Communication Force 15 is carried out is identical with the step S29 that the 1st Department of Communication Force 14 is carried out.
The step S42 that the 2nd Department of Communication Force 15 is carried out～S48 with to 14 execution of the 1st Department of Communication Force step S30～S36 is identical.
The step S49 that the 2nd Department of Communication Force 15 is carried out～S54 with to 14 execution of the 1st Department of Communication Force step S21～S26 is identical.
Step S55, S56 that the 2nd Department of Communication Force 15 is carried out are identical with step S27, S28 that the 1st Department of Communication Force 14 is carried out.
Fig. 9 illustrates the sequential chart of the beacon transmission processing of the 1st Department of Communication Force and the 2nd Department of Communication Force.
Such as Fig. 8 and shown in Figure 9, the 1st Department of Communication Force 14 use predetermined wireless channel (for example 11ch) with the 1st cycle send preserve the beacon signal of switching destination information during (step S21～S25), the 2nd Department of Communication Force 15 is abort state (step S41).Below, with a Department of Communication Force take the 1st cycle send comprise the beacon signal of switching destination information, another Department of Communication Force and be called common action during the abort state during.
And, such as Fig. 8 and shown in Figure 9, the communication conditions of the 1st Department of Communication Force 14 employed wireless channels (for example 11ch) worsens, the 1st Department of Communication Force 14 use 2nd cycle shorter than the 1st cycles to send to comprise the beacon signal of switching destination information during (step S26～S28), the 2nd Department of Communication Force 15 use based on the switching destination channel (for example 15ch) that switches destination information with the 1st cycle transmission beacon signal (step S42～S47).Below, with a Department of Communication Force with the 2nd cycle send comprise beacon signal, another Department of Communication Force of switching destination information use switch destination channel and be called change action during with the 1st cycle transmission beacon signal during.
And, when the wireless terminal device that has carried out radio communication with the 1st Department of Communication Force 14 all switches to radio communication with the 2nd Department of Communication Force 15 (step S48), the 1st Department of Communication Force 14 is abort state (step S29), continue the wireless channel (switching destination channel (for example 15ch)) that use the 2nd Department of Communication Force 15 uses during change action, comprise the beacon that switches destination information with the transmission of the 1st cycle.And the 2nd Department of Communication Force 15 carries out radio communication (step S49～S53), become during the common action with a plurality of wireless terminal devices.
Then, when the communication conditions of the wireless channel (for example 15ch) that uses when the 2nd Department of Communication Force 15 worsens, become during the change action, that is: the 2nd Department of Communication Force 15 sends with the 2nd cycle shorter than the 1st cycle and comprises the beacon signal of switching destination information, and the 1st Department of Communication Force that is in abort state uses based on the switching destination channel that switches destination information and sends beacon signal with the 1st cycle.
In addition, relay 1b is sending in the situation of data request signal the executing data transmission processing from wireless terminal device 2 for the beacon signal that sends.The performed data sending processing of relay 1b is identical with the data sending processing that the relay 1a of execution mode 1 carries out, so description thereof is omitted.
Figure 10 is illustrated in the flow chart of the wireless channel hand-off process of carrying out in the wireless terminal device 2.In addition, processing shown in Figure 10 by the control part 20 in the wireless terminal device 2 and each one cooperate carry out, provide to wireless terminal device 2 electric power during execution.
Step S11～S17 is identical with shown in Figure 6 for step S61～S67, so description thereof is omitted.
Control part 20 is (step S67 in the situation of switching wireless channel; Be), the state (step S68) that terminal communication section 26 is maintained can receive beacon signal, and beginning is based on the timing of timer internal.And control part 20 is differentiated terminal communication section 26 and whether is received beacon signal (step S69).
Receive (step S69 in the situation of beacon signal in terminal communication section 26; Be), control part 20 obtains the switching destination information in the beacon payload that is kept at the beacon signal that receives, this switching destination information that obtains is stored in the storage part 21, and terminal communication section 26 employed wireless channels are switched to wireless channel based on this switching destination information (switching the destination channel) (step S70), turn back to the processing of step S61.
Do not receive (step S69 in the situation of beacon signal in terminal communication section 26; No), whether control part 20 is differentiated from terminal communication section 26 being maintained timing time that the state that can receive beacon signal begins the timer internal of timing and has been passed through and receive hold time (step S71).
(step S71 in the situation of not holding time through reception; No), control part 20 returns the processing of step S69.
Receive (step S71 in the situation of holding time having passed through; Be), according to the switching destination information in the storage part 21 of being stored in that obtains in the beacon signal that is about to receive before the execution in step S68, terminal communication section 26 employed wireless channels are switched to wireless channel (switching destination channel) (step S72) based on this switchings destination information.
Control part 20 is after step S72, terminal communication section 26 is maintained the state that can receive beacon signal, whether and beginning is carried out timing by timer internal, differentiate terminal communication section 26 and use switching destination channel to receive beacon signal (step S73).
Receive (step S73 in the situation of beacon signal in terminal communication section 26; Be), control part 20 obtains the switching destination information in the beacon payload that is kept at the beacon signal that receives, and the switching destination information that this obtains is stored in the storage part 21, turns back to the processing of step S61.
Do not receive (step S73 in the situation of beacon signal in terminal communication section 26; No), whether through and reception hold time (step S74) from terminal communication section 26 being maintained timing time that the state that can receive beacon signal begins the timer internal of timing after the control part 20 discriminating step S72.
(step S74 in the situation of not holding time through reception; No), control part 20 returns the processing of step S73.
Receive (step S74 in the situation of holding time having passed through; Be), control part 20 uses terminal communication section 26 to carry out channel search, detects the communication conditions (step S75) of all wireless channels.Channel search among the step S75 is identical with step S1, so description thereof is omitted.
The communication conditions of each wireless channel that control part 20 obtains according to step S75 is selected the best wireless channel of communication conditions (wireless channel of electric field strength minimum in the electric field strength of each wireless channel that for example, is obtained by step S75).In addition, also can select the reasonable wireless channel of communication conditions.
And control part 20 switches to this wireless channel of selecting (step S76) with terminal communication section 26 employed wireless channels, returns the processing of step S61.
In addition, in that being shown, the beacon signal that receives has with from as the data of destination the time wireless terminal device 2 executing data reception ﹠ disposals.It is identical that wireless terminal device 2 performed data receivers are processed the data receiver processing of carrying out with the wireless terminal device 2 of execution mode 1, so description thereof is omitted.
As previously discussed, according to present embodiment 2, certainly can obtain the effect same with the 1st execution mode, relay 1b uses Department of Communication Force and the wireless terminal device 2 in 2 Department of Communication Forces (the 1st Department of Communication Force, the 2nd Department of Communication Force) to carry out radio communication, in the situation that the communication conditions of the wireless channel that Department of Communication Force uses worsens, can comprise the beacon signal of switching destination information from this Department of Communication Force transmission with the short cycle, and utilize based on this wireless channel that switches destination information from another Department of Communication Force transmission beacon signal.
Therefore, in the situation that the communication conditions of wireless channel worsens, wireless terminal device 2 can improve the probability of the beacon signal that receives the shown switching destination information of wireless channel that another Department of Communication Force of preserving relay 1b uses.
Therefore, can realize rapidization of switching of the wireless channel of wireless terminal device.
In addition, all wireless terminal devices 2 that carried out radio communication can stop the transmission of the beacon signal of being undertaken by a Department of Communication Force in situation about switching to from a Department of Communication Force with the radio communication of another Department of Communication Force.Therefore, the waste that can prevent from not carrying out the wireless channel of radio communication is used, and can prevent the waste of power consumption.
And, wireless terminal device 2 is in the situation of the communication conditions deterioration of terminal communication section 26 employed wireless channels, within the predefined time, if the beacon signal of not receiving, then come switching terminal Department of Communication Force 26 employed wireless channels according to the switching destination information that is stored in the storage part 21, can carry out the reception of beacon signal.
Therefore, even wireless terminal device 2 does not receive up-to-date beacon signal, also can switch to based on the wireless channel that is stored in the switching destination information in the terminal storage section 21 and carry out the reception of beacon signal, so do not need the time be used to the scan channel that carries out all wireless channels, can realize the rapidly switching of wireless channel.
Those skilled in the art expect other advantage and modification easily.Therefore, the present invention is not limited to detail and the representative embodiments that this paper illustrates and describes in its broad sense.Thereby, in the situation of the spirit or scope that do not break away from the total inventive concept that is limited by claims and equivalent thereof, can carry out various modifications.
Claims (7)
1. wireless communication system, it possesses a plurality of wireless terminal devices and carries out the relay of radio communication with described a plurality of wireless terminal devices, and described wireless communication system is characterised in that,
Described relay has:
Storage part, the switching destination information of its storage wireless channel;
2 Department of Communication Forces, it uses any one wireless channel in a plurality of wireless channels to send beacon signal to each described wireless terminal device, carries out radio communication; And
Control part, it is when namely the 1st Department of Communication Force sends the 1st beacon signal by a Department of Communication Force in described 2 Department of Communication Forces, to be stored in the described storage part for the switching destination information that switches at the good wireless channel of described a plurality of wireless channel communication conditions, and be kept in described the 1st beacon signal, send the 1st beacon signal by described the 1st Department of Communication Force with the 1st cycle, in the situation that the communication conditions of employed the 1st wireless channel of described the 1st Department of Communication Force worsens, described the 1st beacon signal was sent from described the 1st Department of Communication Force with the 2nd cycle shorter than described the 1st cycle, and use the 2nd wireless channel based on described switching destination information, with the 2nd beacon signal with another Department of Communication Force from described 2 Department of Communication Forces of described the 1st cycle namely the 2nd Department of Communication Force send, when sending described the 2nd beacon signal by described the 2nd Department of Communication Force, the switching destination information of the wireless channel newly selected is newly stored in the described storage part, and be kept in described the 2nd beacon signal, the 2nd beacon signal is sent with described the 1st cycle by described the 2nd Department of Communication Force
Described wireless terminal device has:
Terminal storage section, the switching destination information of its storage wireless channel;
Terminal communication section, it receives the described beacon signal that sends from described relay with any one wireless channel in described a plurality of wireless channels, carries out radio communication; And
Terminal control section, when it receives described beacon signal in described terminal communication section, be stored in the described terminal storage section being kept at described switching destination information in this beacon signal, and in the situation that the communication conditions of the employed wireless channel of described terminal communication section worsens, the employed wireless channel of described terminal communication section is switched to based on the wireless channel that is stored in the switching destination information in the described terminal storage section.
2. wireless communication system according to claim 1 is characterized in that,
Described control part,
Detect the communication conditions of described a plurality of wireless channels by described Department of Communication Force, select the good wireless channel of communication conditions in the communication conditions of these detected a plurality of wireless channels, and the wireless channel that will select stores in the described storage part as described switching destination information into.
3. wireless communication system according to claim 1 is characterized in that,
Described control part,
Under the described a plurality of wireless terminal devices that carried out radio communication with described the 1st Department of Communication Force all switch to situation with the radio communication of described the 2nd Department of Communication Force, the transmission of preserving the described beacon signal that is stored in the described switching destination information in the described storage part that the shorter cycle in cycle before stopping to be worsened with the communication conditions than described wireless channel by described the 1st Department of Communication Force carries out.
4. wireless communication system according to claim 1 is characterized in that,
Described terminal control section,
Receive in described terminal communication section in the situation of probability less than predefined probability of the described beacon signal that sends from described relay, the communication conditions of differentiating for the employed wireless channel of described terminal communication section worsens.
5. wireless communication system according to claim 1 is characterized in that,
Described terminal control section,
In the situation that the communication conditions of the employed wireless channel of described terminal communication section worsens, make described terminal communication section keep the state that can receive described beacon signal with the predefined time, within this predefined time, do not receive in the situation of described beacon signal, switch the employed wireless channel of described terminal communication section according to the described switching destination information that is stored in the described terminal storage section, carry out the reception of described beacon signal.
6. wireless communications method, it is the wireless communications method of a plurality of wireless terminal devices and relay, described a plurality of wireless terminal device has terminal communication section, this terminal communication section receives the beacon signal that sends from relay with any one wireless channel in a plurality of wireless channels, carries out radio communication; Described relay has 2 Department of Communication Forces, these 2 Department of Communication Forces use any one wireless channel in described a plurality of wireless channel to send described beacon signal to each described wireless terminal device, carry out radio communication, described wireless communications method is characterised in that, may further comprise the steps:
When namely the 1st Department of Communication Force sends the 1st beacon signal by a Department of Communication Force in described 2 Department of Communication Forces, to be stored in the storage part that described relay has for switching to switching destination information at the good wireless channel of described a plurality of wireless channel communication conditions, and be kept at step in described the 1st beacon signal;
Described the 1st Department of Communication Force sends the step of the 1st beacon signal with the 1st cycle;
In the situation that the communication conditions of employed the 1st wireless channel of described the 1st Department of Communication Force worsens, described the 1st beacon signal was sent from described the 1st Department of Communication Force with the 2nd cycle shorter than described the 1st cycle, and use the 2nd wireless channel based on described switching destination information, with the 2nd beacon signal with another Department of Communication Force from described 2 Department of Communication Forces of described the 1st cycle namely the 2nd Department of Communication Force send, when sending described the 2nd beacon signal by described the 2nd Department of Communication Force, the switching destination information of the wireless channel newly selected is newly stored in the described storage part, and be kept in described the 2nd beacon signal step that the 2nd beacon signal is sent with described the 1st cycle by described the 2nd Department of Communication Force;
When the described terminal communication section of described wireless terminal device receives described beacon signal, be stored in step in the terminal storage section that described wireless terminal device has with being kept at described switching destination information in this beacon signal; And
In the situation that the communication conditions of the employed wireless channel of described terminal communication section worsens, the employed wireless channel of described terminal communication section is switched to based on the wireless channel step that is stored in the switching destination information in the described terminal storage section.
7. wireless communications method according to claim 6 is characterized in that,
Described Department of Communication Force sends in the step of the beacon signal of preserving described switching destination information,
Detect the communication conditions of described a plurality of wireless channels by described Department of Communication Force, select the good wireless channel of communication conditions in the communication conditions of these detected a plurality of wireless channels, and the wireless channel that will select stores in the described storage part as described switching destination information into.
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- 2010-05-05 US US12/774,122 patent/US8345590B2/en active Active
- 2010-05-24 TW TW099116444A patent/TWI418168B/en active
- 2010-05-25 CN CN2010101882720A patent/CN101902767B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1285664A (en) * | 1999-08-18 | 2001-02-28 | 阿尔卡塔尔公司 | Method and system for selecting channel in radio communication system |
| CN1890927A (en) * | 2003-12-16 | 2007-01-03 | 英特尔公司 | Preemptive dynamic frequency selection |
| WO2009034354A1 (en) * | 2007-09-13 | 2009-03-19 | Iti Scotland Limited | Channel switching in a communication network |
| WO2010007738A1 (en) * | 2008-07-15 | 2010-01-21 | パナソニック株式会社 | Control device, terminal device, and communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101902767A (en) | 2010-12-01 |
| US20100296434A1 (en) | 2010-11-25 |
| TWI418168B (en) | 2013-12-01 |
| JP4835723B2 (en) | 2011-12-14 |
| JP2010273250A (en) | 2010-12-02 |
| US8345590B2 (en) | 2013-01-01 |
| TW201132035A (en) | 2011-09-16 |
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